Why is it necessary for a helicopter to have two propellers?
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The big one overhead is the main rotor. It acts as both wing, to provide lift, and as propeller, to generate forward (or sideways or backwards) motion.
Newton’s 3rd law of motion is: for every action, there is an equal and opposite reaction. So as the big giant fan spins in one direction, torque will cause the fuselage of the helicopter to spin in the opposite direction. Hence the small propeller at the rear. This is called the “anti-torque” rotor. It essentially pushes the tail of the helicopter against the torque of the main rotor.
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Newton’s 3rd law of motion is: for every action, there is an equal and opposite reaction. So as the big giant fan spins in one direction, torque will cause the fuselage of the helicopter to spin in the opposite direction. Hence the small propeller at the rear. This is called the “anti-torque” rotor. It essentially pushes the tail of the helicopter against the torque of the main rotor.
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